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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Roger Pau Monne <roger.pau@citrix.com>, <xen-devel@lists.xenproject.org>
Cc: Ian Jackson <iwj@xenproject.org>, Wei Liu <wl@xen.org>
Subject: Re: [PATCH 16/21] libs/guest: make a cpu policy compatible with older Xen versions
Date: Thu, 1 Apr 2021 17:31:18 +0100	[thread overview]
Message-ID: <ab195203-1ed7-2e9f-b684-11e9dc397661@citrix.com> (raw)
In-Reply-To: <20210323095849.37858-17-roger.pau@citrix.com>

On 23/03/2021 09:58, Roger Pau Monne wrote:
> Older Xen versions used to expose some CPUID bits which are no longer
> exposed by default. In order to keep a compatible behavior with
> guests migrated from versions of Xen that don't encode the CPUID data
> on the migration stream introduce a function that sets the same bits
> as older Xen versions.
>
> This is pulled out from xc_cpuid_apply_policy which already has this
> logic present.
>
> No functional change intended.
>
> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
> ---
>  tools/include/xenctrl.h         |  4 ++++
>  tools/libs/guest/xg_cpuid_x86.c | 39 ++++++++++++++++++++++++++++-----
>  2 files changed, 37 insertions(+), 6 deletions(-)
>
> diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h
> index 5f3e5e17e9d..6f7158156fa 100644
> --- a/tools/include/xenctrl.h
> +++ b/tools/include/xenctrl.h
> @@ -2627,6 +2627,10 @@ int xc_cpu_policy_calc_compatible(xc_interface *xch,
>                                    const xc_cpu_policy_t p2,
>                                    xc_cpu_policy_t out);
>  
> +/* Make a policy compatible with previous Xen versions. */
> +int xc_cpu_policy_make_compatible(xc_interface *xch, xc_cpu_policy_t policy,
> +                                  bool hvm);

I think this probably wants  "pre-4.14(?)" somewhere obvious, because
"compatible" on its own is very ambiguous.

~Andrew


  parent reply	other threads:[~2021-04-01 16:31 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23  9:58 [PATCH 00/21] libs/guest: new CPUID/MSR interface Roger Pau Monne
2021-03-23  9:58 ` [PATCH 01/21] libxl: don't ignore the return value from xc_cpuid_apply_policy Roger Pau Monne
2021-03-30 15:21   ` Jan Beulich
2021-03-30 15:38   ` Andrew Cooper
2021-03-31 18:12   ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 02/21] libs/guest: rename xc_get_cpu_policy_size to xc_cpu_policy_get_size Roger Pau Monne
2021-03-31 19:03   ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 03/21] libs/guest: introduce xc_cpu_policy_t Roger Pau Monne
2021-03-31 20:10   ` Andrew Cooper
2021-04-01  8:48     ` Roger Pau Monné
2021-03-23  9:58 ` [PATCH 04/21] libs/guest: introduce helper to fetch a system cpu policy Roger Pau Monne
2021-03-30 15:35   ` Jan Beulich
2021-04-01 13:56   ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 05/21] libs/guest: introduce helper to fetch a domain " Roger Pau Monne
2021-03-30 15:37   ` Jan Beulich
2021-03-31 11:06     ` Roger Pau Monné
2021-04-01 13:32       ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 06/21] libs/guest: introduce helper to serialize a " Roger Pau Monne
2021-03-23  9:58 ` [PATCH 07/21] tools: switch existing users of xc_get_{system,domain}_cpu_policy Roger Pau Monne
2021-03-23  9:58 ` [PATCH 08/21] libs/guest: introduce a helper to apply a cpu policy to a domain Roger Pau Monne
2021-03-23  9:58 ` [PATCH 09/21] libs/guest: allow fetching a specific CPUID leaf from a cpu policy Roger Pau Monne
2021-04-01 14:47   ` Andrew Cooper
2021-04-08 15:53     ` Roger Pau Monné
2021-03-23  9:58 ` [PATCH 10/21] libs/guest: allow fetching a specific MSR entry " Roger Pau Monne
2021-03-23  9:58 ` [PATCH 11/21] libs/guest: allow updating a cpu policy CPUID data Roger Pau Monne
2021-03-30 15:56   ` Jan Beulich
2021-03-31 12:47     ` Roger Pau Monné
2021-04-01 14:55   ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 12/21] libs/guest: allow updating a cpu policy MSR data Roger Pau Monne
2021-03-23  9:58 ` [PATCH 13/21] libs/guest: switch users of xc_set_domain_cpu_policy Roger Pau Monne
2021-04-01 15:04   ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 14/21] libs/guest: introduce helper to check cpu policy compatibility Roger Pau Monne
2021-03-30 16:02   ` Jan Beulich
2021-03-31 12:40     ` Roger Pau Monné
2021-03-31 14:57       ` Jan Beulich
2021-04-01 16:14   ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 15/21] libs/guest: obtain a compatible cpu policy from two input ones Roger Pau Monne
2021-03-31 15:24   ` Jan Beulich
2021-04-01 16:26   ` Andrew Cooper
2021-04-09 10:56     ` Roger Pau Monné
2021-03-23  9:58 ` [PATCH 16/21] libs/guest: make a cpu policy compatible with older Xen versions Roger Pau Monne
2021-03-31 15:29   ` Jan Beulich
2021-04-01 16:31   ` Andrew Cooper [this message]
2021-03-23  9:58 ` [PATCH 17/21] libs/guest: introduce helper set cpu topology in cpu policy Roger Pau Monne
2021-04-01 17:22   ` Andrew Cooper
2021-03-23  9:58 ` [PATCH 18/21] libs/guest: rework xc_cpuid_xend_policy Roger Pau Monne
2021-03-23  9:58 ` [PATCH 19/21] libs/guest: apply a featureset into a cpu policy Roger Pau Monne
2021-03-23  9:58 ` [PATCH 20/21] libs/{light,guest}: implement xc_cpuid_apply_policy in libxl Roger Pau Monne
2021-04-01 17:44   ` Andrew Cooper
2021-04-09 14:57     ` Roger Pau Monné
2021-03-23  9:58 ` [PATCH 21/21] libs/guest: (re)move xc_cpu_policy_apply_cpuid Roger Pau Monne
2021-04-01 17:53   ` Andrew Cooper

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